US4113624A - Flotation apparatus with mechanical agitation - Google Patents

Flotation apparatus with mechanical agitation Download PDF

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Publication number
US4113624A
US4113624A US05/713,371 US71337176A US4113624A US 4113624 A US4113624 A US 4113624A US 71337176 A US71337176 A US 71337176A US 4113624 A US4113624 A US 4113624A
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US
United States
Prior art keywords
agitator
flotation apparatus
central hub
frusto
flotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/713,371
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English (en)
Inventor
Jean-Arnaud Casalis
Yves Teil
Raymond Motte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe Miniere et Metallurgique de Penarroya
Original Assignee
Societe Miniere et Metallurgique de Penarroya
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of US4113624A publication Critical patent/US4113624A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids

Definitions

  • the invention relates to an improved agitator for use in flotation.
  • Flotation is a well-known method of separating finely crushed particles and is used extensively for concentrating ores, coal sludge and other minerals. It is carried out in tanks, in which the pulp, that is, a mixture of water and the substance to be processed, generally with the addition of a foaming agent and various other substances, is supplied to the tank bottom.
  • this process was carried out in a static fashion by passing gas through the flotation tanks so that the gas bubbles traversing the pulp collected the mineral particles and carried them to the surface, where the foam could be skimmed off.
  • the yield of this operation was generally poor, due to the inadequate distribution of the reagents and gas through the vessels and owing to sedimentation of the pulp, which occurred because the passage of the gas did not sufficiently agitate the pulp.
  • the gas required for flotation is injected into the upper portion of a hollow axial hub, which connects the circular bases and whose lower portion contains outlets through which the gas escapes to the pulp during processing; the outlets are a central orifice in the base of the hub and vertical slots, or "ports", in its lateral surface.
  • An object of the invention is to provide an improvement over apparatus of this type, so as to increase its efficiency but not its power consumption, and which can readily be constructed using the flotation agitator described above.
  • a flotation agitator with crossed bars also comprises a solid, downwardly open, frusto-conical skirt which is situated between the bars and the central hub, is coaxial with the hub and is mounted at its upper (narrower) end to the hub.
  • the frusto-conical skirt is extended upwards at its narrower end by a cylindrical sleeve, which latter is attached to the central axis of the agitator.
  • a cylindrical sleeve which latter is attached to the central axis of the agitator.
  • the frusto-conical skirt and the cylindrical sleeve which extends it upwards are made in one piece.
  • the assembly formed by the frusto-conical skirt and cylindrical sleeve will often be referred to hereinafter as the "air deflector cone" (which term is explained below).
  • this air deflector cone and its position relative to the crossed-bar agitator depend to a large extent on the dimensions of the agitator and on the nature of the pulp to be processed. However, it is an advantage if the bottom of the air deflector cone is below the zone in which the two layers of bars intersect.
  • the bottom of the air deflector cone is preferably above the ports formed in the central hub of the cross-bar agitator.
  • the bottom of the cone is at a level close to the lowest orifice in the central hub.
  • FIGURE represents an axial section through an agitator according to the invention.
  • the agitator comprises a central hub 1 and two layers of bars 2, 3 arranged on the generatrices of two opposite, coaxial truncated cones. At their ends the bars are mounted on circular bases, the upper base being designated 4 in the FIGURE and the lower base 5.
  • the base 4 is solid, whereas the base 5 contains holes (not shown) to enable the pulp processed to circulate.
  • the central hub 1 is provided at its upper end with means (not shown) for supplying it with air under pressure. At its lower end it contains an axial orifice 7 through which air escapes. In addition, its lateral surface contains four ports 8 through which some of the air injected can also escape.
  • the ports are vertical slots, of which the uppermost ends are approximately halfway up the hub 1.
  • the height of the slots may be adjustable, at least in experimental apparatus.
  • the agitation apparatus just described substantially corresponds to a version disclosed in the above-mentioned French Pat. No. 1,200,365.
  • the flotation agitator according to the present invention differs from this essentially in the addition of an air deflector, generally designated 6 in the accompanying FIGURE.
  • the deflector 6 is preferably made in one piece and consists essentially of a cylindrical upper portion 6a mounted on the central hub 1 and extended downwards by a frusto-conical portion 6b flaring towards the lower base 5 of the apparatus.
  • the agitator used in this example is a crossed-bar agitator similar to that described in the above-mentioned French patent specification and with substantially the same proportions as those indicated in the accompanying drawing, its external diameter being 440 mm and the diameter of its central hub 1 being 120 mm.
  • the agitator is immersed in a flotation vessel of capacity 1 m 3 and is driven by an electric motor at the rate of 315 rev/min, corresponding to a peripheral speed of 7.5 m/sec. at the upper base 4.
  • the central hub 1 of the agitator is connected by its upper portion to a compressor of air provided with a pressure-reducer for which the upstream pressure is 5.5 bars and the downstream pressure 0.1 bar, the air flow rate supplied to the agitator being measured by means of a flow meter graduated to give readings of 500 to 2000 l/min.
  • Height above top of ports 8 as desired, e.g. 15 mm
  • a first series of experiments measured the power consumed by rotating the two types of apparatus under various operating conditions: firstly, with the flotation cell empty, then with the cell full but without any air being injected, and finally with the cell full and the compressed air required for flotation being admitted to the central hub of the agitator at various rates between 500 and 2000 liters per minute.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing Of Solid Wastes (AREA)
US05/713,371 1975-08-14 1976-08-11 Flotation apparatus with mechanical agitation Expired - Lifetime US4113624A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7525429 1975-08-14
FR7525429A FR2320784A1 (fr) 1975-08-14 1975-08-14 Dispositif ameliore de flottation avec agitation mecanique

Publications (1)

Publication Number Publication Date
US4113624A true US4113624A (en) 1978-09-12

Family

ID=9159107

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/713,371 Expired - Lifetime US4113624A (en) 1975-08-14 1976-08-11 Flotation apparatus with mechanical agitation

Country Status (21)

Country Link
US (1) US4113624A (bg)
JP (1) JPS605344B2 (bg)
AU (1) AU503051B2 (bg)
BE (1) BE844929A (bg)
BG (1) BG31215A3 (bg)
BR (1) BR7605282A (bg)
CA (1) CA1066820A (bg)
CS (1) CS199635B2 (bg)
DD (1) DD125329A5 (bg)
DE (1) DE2635831C3 (bg)
ES (1) ES450680A1 (bg)
FR (1) FR2320784A1 (bg)
GB (1) GB1518862A (bg)
IT (1) IT1062691B (bg)
MX (1) MX142973A (bg)
PH (1) PH14480A (bg)
PL (1) PL107285B1 (bg)
RO (1) RO76902A (bg)
SU (1) SU645529A3 (bg)
YU (1) YU37277B (bg)
ZA (1) ZA764821B (bg)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0756884A1 (de) * 1995-08-04 1997-02-05 Premark Feg Corporation Filtervorrichtung
CN103949354A (zh) * 2014-05-06 2014-07-30 张立 一种用于浮选机的翻料器
CN107930861A (zh) * 2017-11-07 2018-04-20 中国矿业大学(北京) 一种可调节浮选高度的宽粒级矿物浮选装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0433353U (bg) * 1990-07-16 1992-03-18

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308751A (en) * 1941-04-24 1943-01-19 Chicago By Products Corp Means for dispersing one fluid in another fluid
US2944802A (en) * 1955-02-16 1960-07-12 Denver Equip Co Froth flotation and aeration apparatus
US3067988A (en) * 1958-04-30 1962-12-11 Penarroya Miniere Metall Flotation with mechanical agitation
US3752313A (en) * 1971-02-19 1973-08-14 Penarroya Miniere Metall Flotation apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308751A (en) * 1941-04-24 1943-01-19 Chicago By Products Corp Means for dispersing one fluid in another fluid
US2944802A (en) * 1955-02-16 1960-07-12 Denver Equip Co Froth flotation and aeration apparatus
US3067988A (en) * 1958-04-30 1962-12-11 Penarroya Miniere Metall Flotation with mechanical agitation
US3752313A (en) * 1971-02-19 1973-08-14 Penarroya Miniere Metall Flotation apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0756884A1 (de) * 1995-08-04 1997-02-05 Premark Feg Corporation Filtervorrichtung
CN103949354A (zh) * 2014-05-06 2014-07-30 张立 一种用于浮选机的翻料器
CN107930861A (zh) * 2017-11-07 2018-04-20 中国矿业大学(北京) 一种可调节浮选高度的宽粒级矿物浮选装置

Also Published As

Publication number Publication date
FR2320784A1 (fr) 1977-03-11
CS199635B2 (en) 1980-07-31
YU199676A (en) 1983-04-27
BR7605282A (pt) 1977-08-09
FR2320784B1 (bg) 1980-05-09
GB1518862A (en) 1978-07-26
AU503051B2 (en) 1979-08-23
ZA764821B (en) 1977-07-27
DE2635831B2 (de) 1977-10-06
DE2635831C3 (de) 1978-06-01
YU37277B (en) 1984-08-31
CA1066820A (en) 1979-11-20
RO76902A (ro) 1981-08-30
MX142973A (es) 1981-01-28
DE2635831A1 (de) 1977-02-24
BG31215A3 (bg) 1981-11-16
DD125329A5 (bg) 1977-04-13
ES450680A1 (es) 1977-07-16
AU1671876A (en) 1978-02-16
PL107285B1 (pl) 1980-02-29
PH14480A (en) 1981-08-07
JPS605344B2 (ja) 1985-02-09
SU645529A3 (ru) 1979-01-30
IT1062691B (it) 1984-10-20
JPS5223505A (en) 1977-02-22
BE844929A (fr) 1977-02-07

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